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None as such... NTFS is an outdated filesystem (FAT32 moreso, but at least it's open-source). There aren't any plans to add NTFS, but it's likely in coming years we'll see exFAT and APFS (Apple's new file system).
You'll have no problems running that drive near it's maximum in a FAT32 file system... besides, the RX2 is still a USB2.0 unit anyhow, where you get the benefits of that drive are exporting from rekordbox!